I am having some fun with the new inductors I got and a little solar panel.
I have built a circuit (attached) that generates 50V open circuit from a 1.8V solar panel output. I am just using a 60W bulb to power the solar panel while testing it. It can generate 2.7V in full sun.
Short circuit I get at 1.8V - 22mA
Connecting the +side of the battery through a multimeter I get about +6mA flow to an almost full charged battery pack. The tiny13 is running on the solar power simply toggling pinb0. When I move the lamp away from the panel the flow drops to 0 at about 1V on the solar panel. As I move it further the panel drops and the folw goes negative from the battery to the tiny13. At that point I plan to do some sleep mode with the chip and turn on an led using a RC timed circuit that will automatically turn off the led after a number of hours. The voltage to the chip is between 2.4V and 2.8V
The chip is running at 4.8mhz no clk div.
So at normal desk illumination I still get a positive flow to the battery pack.
One thing I know will be a problem is when the battery pack drops below the full turn on threshold of the 2n7000 fet. Is there a fet I can use that has a full on at 1.8V (lowest I can run the tiny13v) or would I have to wait for the solar panel to reach enough power and tap off of that.
How bad of a design is this so far and what could improve it. remember I did not go to college and I am in this to learn the hard knocks way.
I would think using an interrupt timer to generate the pulse would be one thing, turning off all the extra power in the chip of course.
oops forgot to show the .1uf across the tiny13 pwr-gnd.
main: sbi pinb,1 nop nop rjmp main
After walking away for a few minutes, I came up with using an inductor to generate a higher voltage from the pin with another inductor. Basically instead of turning the pin on and off I turn it from output low to input highz, at that point the inductor kicks back almost a volt higher, attached chart.